Fan base



FIG. 1 is a right, front, top perspective view of a fan base in accordance with the present invention;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left-side elevation view thereof;

FIG. 5 is a right-side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a bottom, left, front perspective view thereof.

The broken lines in the figures depict portions of the fan base that form no part of the claimed design. 

CLAIM The ornamental design for a fan base, as shown and described. 